Have a switch pitch 400 in one of my off topic hot rods, been in since I got it. Car been sitting about 3 yrs. got it out to take to a show, left it idle quite awhile, ran it thru the gears sitting still, brought everything up to temp to checked all fluids. Car runs and shifts great but has a indescribable noise when placed in reverse or drive gears. It is kind of a low whistle/growl. Stators in the converter stuck? The dual stall works off a switch and the noise is in either mode, Thanks, sorry for being long.